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Thu, 27 Nov 2025 21:20:45 -0800 (PST) Received: from avri-office.sdcorp.global.sandisk.com ([129.253.242.14]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4791116c3c0sm65802385e9.8.2025.11.27.21.20.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Nov 2025 21:20:44 -0800 (PST) From: Avri Altman X-Google-Original-From: Avri Altman To: Ulf Hansson , linux-mmc@vger.kernel.org Cc: Avri Altman Subject: [PATCH v2 2/2] mmc: core: Add quirk for incorrect manufacturing date Date: Fri, 28 Nov 2025 07:20:11 +0200 Message-Id: <20251128052011.204735-3-avri.altman@sandisk.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251128052011.204735-1-avri.altman@sandisk.com> References: <20251128052011.204735-1-avri.altman@sandisk.com> Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Some eMMC vendors need to report manufacturing dates beyond 2025 but are reluctant to update the EXT_CSD revision from 8 to 9. Changing the Updating the EXT_CSD revision may involve additional testing or qualification steps with customers. To ease this transition and avoid a full re-qualification process, a workaround is needed. This patch introduces a temporary quirk that re-purposes the year codes corresponding to 2010, 2011, and 2012 to represent the years 2026, 2027, and 2028, respectively. This solution is only valid for this three-year period. After 2028, vendors must update their firmware to set EXT_CSD_REV=9 to continue reporting the correct manufacturing date in compliance with the JEDEC standard. The `MMC_QUIRK_BROKEN_MDT` is introduced and enabled for all Sandisk devices to handle this behavior. Signed-off-by: Avri Altman --- drivers/mmc/core/card.h | 6 ++++++ drivers/mmc/core/mmc.c | 5 +++++ drivers/mmc/core/quirks.h | 3 +++ include/linux/mmc/card.h | 1 + 4 files changed, 15 insertions(+) diff --git a/drivers/mmc/core/card.h b/drivers/mmc/core/card.h index 1200951bab08..a9619dd45270 100644 --- a/drivers/mmc/core/card.h +++ b/drivers/mmc/core/card.h @@ -89,6 +89,7 @@ struct mmc_fixup { #define CID_MANFID_MICRON 0x13 #define CID_MANFID_SAMSUNG 0x15 #define CID_MANFID_APACER 0x27 +#define CID_MANFID_SANDISK_MMC 0x45 #define CID_MANFID_SWISSBIT 0x5D #define CID_MANFID_KINGSTON 0x70 #define CID_MANFID_HYNIX 0x90 @@ -305,4 +306,9 @@ static inline int mmc_card_no_uhs_ddr50_tuning(const struct mmc_card *c) return c->quirks & MMC_QUIRK_NO_UHS_DDR50_TUNING; } +static inline int mmc_card_broken_mdt(const struct mmc_card *c) +{ + return c->quirks & MMC_QUIRK_BROKEN_MDT; +} + #endif diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index f744dd501842..8846550a8892 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -676,6 +676,11 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd) /* Adjust production date as per JEDEC JESD84-B51B September 2025 */ if (card->cid.year < 2023) card->cid.year += 16; + } else { + /* Handle vendors with broken MDT reporting */ + if (mmc_card_broken_mdt(card) && card->cid.year >= 2010 && + card->cid.year <= 2012) + card->cid.year += 16; } } diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h index c417ed34c057..f5e8a0f6d11b 100644 --- a/drivers/mmc/core/quirks.h +++ b/drivers/mmc/core/quirks.h @@ -170,6 +170,9 @@ static const struct mmc_fixup __maybe_unused mmc_ext_csd_fixups[] = { MMC_FIXUP_EXT_CSD_REV(CID_NAME_ANY, CID_MANFID_NUMONYX, 0x014e, add_quirk, MMC_QUIRK_BROKEN_HPI, 6), + MMC_FIXUP(CID_NAME_ANY, CID_MANFID_SANDISK_MMC, CID_OEMID_ANY, add_quirk_mmc, + MMC_QUIRK_BROKEN_MDT), + END_FIXUP }; diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index e9e964c20e53..4722dd7e46ce 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -329,6 +329,7 @@ struct mmc_card { #define MMC_QUIRK_BROKEN_CACHE_FLUSH (1<<16) /* Don't flush cache until the write has occurred */ #define MMC_QUIRK_BROKEN_SD_POWEROFF_NOTIFY (1<<17) /* Disable broken SD poweroff notify support */ #define MMC_QUIRK_NO_UHS_DDR50_TUNING (1<<18) /* Disable DDR50 tuning */ +#define MMC_QUIRK_BROKEN_MDT (1<<19) /* Wrong manufacturing year */ bool written_flag; /* Indicates eMMC has been written since power on */ bool reenable_cmdq; /* Re-enable Command Queue */ -- 2.34.1